app: fix builder registration and add teku integration test

[corverroos]

• Fixes issue with builder registration domain calculation.
• Also adds teku proposer config endpoint
• Also fixes registration deadline issue
• Adds integration test using teku/develop image.

category: feature
ticket: #849

[codecov]

Codecov Report

Merging #957 (495014c) into main (b40678b) will decrease coverage by 0.64%.
The diff coverage is 21.05%.

@@            Coverage Diff             @@
##             main     #957      +/-   ##
==========================================
- Coverage   54.58%   53.93%   -0.65%     
==========================================
  Files         116      117       +1     
  Lines       12696    12741      +45     
==========================================
- Hits         6930     6872      -58     
- Misses       4767     4868     +101     
- Partials      999     1001       +2     

Impacted Files	Coverage Δ
core/deadline.go	70.90% <0.00%> (ø)
core/validatorapi/teku.go	0.00% <0.00%> (ø)
testutil/beaconmock/options.go	42.67% <0.00%> (-0.14%)	⬇️
testutil/beaconmock/server.go	54.09% <0.00%> (-0.45%)	⬇️
testutil/validatormock/validatormock.go	35.75% <0.00%> (+0.10%)	⬆️
eth2util/signing/signing.go	40.65% <50.00%> (-5.61%)	⬇️
core/validatorapi/validatorapi.go	53.76% <57.14%> (+0.05%)	⬆️
core/validatorapi/router.go	64.72% <66.66%> (-0.04%)	⬇️
core/qbft/qbft.go	71.67% <0.00%> (-10.31%)	⬇️
cmd/bootnode.go	34.30% <0.00%> (-2.71%)	⬇️
... and 5 more

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